Refrigerating apparatus



Aug. 17, 1937.

H. w. AslRE 2,090,247 REFRIGERATING APPARATUS Filed Nov. 29, 1933 2 Sheets-Sheet l \\\\\\nnpnnil|||llmu'nuyuuq//uy 7 30 4o so 705090,00 l

NVENTOR 33 (59j BY \2 ATTO R N EY S Patented ug. 17, 1937 UNITED STATES PATENT lori-ICE REFRIGERATIN G APPARATUS Horace W. Asire, Detroit, Mich., assigner to General Motors Corporation, Dayton, hio, a corporation of Delaware 8 Claims.

'I'his invention relates to refrigerant dehumidifying apparatus and more particularly to control means therefor.

It is an object of my invention to provide a refrigerant dehumidifying apparatus with an extremely accurate and yet durable and reliable humidity control.

It is another object of my invention to provide an accurate humidostat controlled by paper l0 strips which are coiled around the operating mechanism so as to make the humidity control compact and to use one paper strip for controlling an electric circuitand another paper strip to indicate the humidity.

i5 It is a further object of my invention to provide an, improved substantially frictionless mounting support for the paper strips and to provide a simplified adjusting means therefor.

Further objects and advantages of the present :o invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings: v

5 Fig. 1 is a view partly in section disclosing a refrigerant dehumidifying apparatus and control means therefor embodyingmy invention;

Fig. 2 is a front view of my improved control apparatus;

0 Fig. 3 is a side sectional View of the apparatus shown in Fig. 2;

Fig. 4 is a front view of the control apparatus shown in Fig. 2 with the cover removed; and

Fig, 5 is a sectional view along the line 5-5 5 of Fig. 3.

Referring to the drawings and more particu:`

larly to Fig. 1, there is shown a room having walls 2|. Within the room 20 there is provided a dehumidifier in the form of a cabinet 22 con- 0 taining a centrifugal fan 23 which draws air from the room and circulates it over the refrigerant evaporator 24 after which the cooled and dehumidifled air passes out through the grille 25 in the top of the cabinet 22.

5 The refrigerant evaporator 24 is supplied with liquid refrigerant by a refrigerant liquefying apparatus comprising a compressor 26 for compressing the refrigerant and for forwarding the compressed refrigerant to a condenser'21 where the 3 compressed refrigerant is liquefied and collected in the receiver 28. From thereceiver 28 the liquid refrigerant is forwarded to a supply conduit 29 under the control of a suitable automatic expansion valve 30 to the refrigerant evaporator 24 3 where the refrigerant absorbs heat and vaporizes.

" fastening the -.cover 40 to the base.

The vaporized refrigerant is returned to the compressor through the return conduit 3|. 'I'he compresser 26 is driven by an electric motor 32 through pulley and belt means 33. i

'I'he operation of the electric motor 32 is controlled by a relay 34 of any suitable type which in turn is controlled by a humidostat 35 located in an .electric circuit 36 which is in parallel circuit relation with the electric motor 32.

Referring now to Figs. I2 to 5 inclusive for a more complete description of the humidostat 35, there is shown a removable ornamental outer casing or cover 40 mounted upon the rbase 4| provided with pedestals or pins 42 which receive the screws |43 at their upper ends for Beneath the cover 40 there is provided a switch means in the form of a bell crank lever 43 pivoted upon the pivot pin 44 and provided with an electric contact member 45 at its lower end which cooperates with an adjustable stationary contact 46 to open and close the electric circuit 36 which in turn controls the energization of the relayl 34. 'I'he bell crank lever 43 is also provided with a piece 41 of a magnetic material riveted thereto which cooperates with a permanent magnet 48 adjustably secured by a screw 49 to an insulating sub-base 50 which is mounted upon the main base 4|. This permanent magnet in cooperation with the magnetic piece 41 insures a good opening and closing of the contacts 45 and 46, and in this way prevents arclng at the contacts.

The bell crank lever 43 is operated by a long coiled humidity responsive paper strip or ribbon 5| which is fastened to the bell crank lever 4 3 by a screw 52 and which extends over a pin 53 upon the horizontal arm 54 of the bell crank lever 43. wardly and extends aroundthe-sectors 55, 56, 51, and 58 which are provided with rounded flanges, such as the flange 59 on the sector member 55 so as to receive and hold in coiled relation the long paper strip so that as little space as possible is required for the device. These sector members are individually mounted upon the pins 6| which are provided with knife edges cooperating with th'e vaperture at the inner end of each of the sector membersso that an almost frictionless pivotal supportlfor the sector members and the paper strip is provided. The opposite end of the paper strip is fastened to the free end of van adjusting lever 63 which is pivoted upon the pin 64' and which is controlled by an adjusting means including a threaded member 65 connected to the lever The paper strip then extends downl air.

which cooperates with a nut 66 having a scale 61 and knurled ange 68 connected thereto so that the switch may be manually adjusted to obtain the humidity desired. A light tension spring 68 5 connects the bell crank lever 43 with a pin 8,4

and an electrical binding post 83 to supply electric energy to the contact 45 4and to maintain the paper strip taut. A second binding post 85` is connected with the stationary contact 46. By the l0 use of such a device a very accurate and yet durable and reliable control is provided.

i Referring now more particularly to Figs. 3 and 4, it will be seen that above the switch mechanism there is provided a humidity indicating mech'- anism employing a long pointer or indicator 10 pivoted to 'the pin 1I fixed to the basen At its upper end, this pointer cooperates with a scale screw 16. This screw also holds a bracket which supports one end of a spring 11 which'maintains a slight tension upon the bell crank lever 14 so as to maintain the humidity responsive paper,

strip 15 taut. The humidity responsive paper strip 15 continues around the second set of sector members 18 which are also mounted upon the knife edge-pins 6I. The opposite end of this paper strip 15 is fastened to an adjusting post or screw 80 which provides a means for adjusting the pointer 10 to the scale 12 so that the de- Yvice will properly indicate the humidity of the By providing a second paper strip to.indicate the humidity, less strain is put upon each of the paper strips and since the strips are placed side by side and mounted on the same knife edge Pins, the construction is greatly simplified andyet made very accurate. This construction also facilitates the adjustment of the paper strip. While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow. What is claimed is as follows:

` 1. A humidostat including a plurality of levers mounted upon a common pivot, a plurality of humidity responsive paper strips individually connected with the levers, a base for supporting the common pivot, thel levers, and the paper strips. one of the levers being provided with a switch contact, a stationary contact cooperating with the switch contact, a humidity indicating means conl nected to the other lever, an adjustable anchor-l age for the other end of each of the strips, and a casing surrounding the mechanism and co- 70 connected to the lever and the other end being connected to the adjustable anchorage for controlling the opening and closing of the electric circuit.

3..A humidostat comprising a lever, a means connected theretofr opening and closing an 5 electric circuit, a plurality of sector members mounted upon knife edges, an-adjustable anchorage, a humidity responsive paper strip held upon and extending around the sector members, one end of the paper strip being connected to the l0 lever.' and the other end being connected to the adjustable anchorage for controlling the opening'. and closing of the electric circuit. a second set ofy sector members mounted upon the knife edges aside of the first set of sector members, a 16 humidity scale. humidity indicatingmeans cooperating with the scale, an anchor and a second humidity responsive paper strip extending around the second set of sector members and being connected at one to the humidity indicating 20 means andbeing connected at lits opposite end to the anchor for controlling theyhumidity indicating means, and a casing enclosingJ said i mechanism.

. to open and close the switch contacts.

5. A humidostat comprising a scale, a pointer cooperating with the scale for indicating humid- 35 ity, a plurality of knife edges, a plurality of rounded members pivotally mounted upon the knife edges, a humidity responsive strip coiled around the rounded members and having one end operatively connected with thepointer for 40 moving the pointer to indicate humidity.

6. A humidostat comprising a lever and a means connected to the lever to be operated, a plurality of knife edges. a plurality of rounded members pivotally mounted upon the knife edges. 45 a humidity responsive strip coiled around the rounded members and having one end connected to the lever to move the lever and the means connected thereto. l

7. A humidostat comprising a member to be 50 operated according to changes linl humidity, a plurality of knife, edges, a plurality of supporting members pivotally mounted upon the knife edges, a humidity responsive strip coiled around the supporting members and having one end con- 55 nected to the member to be operated for operf ating the member according to changes in hu- 8. A:,humidostat'coxnprising a member to be operated according to lchanges in humidity, a 60 plurality of pins having a plurality of intersecting fiat sides for forming a knife edge 'upon each of the pins, a movable member for each of the pins, each of saidx movable membersbeing pro vided with a round aperture threaded upon a pin, and a humidity responsive strip coiled around and supported by said movable members, and having a portion fastened to said member to be operated.

HORACE W. ASKIRE. 7i 

